As opinions seem to conflict, particularly about silicone, I'd appreciate recommendations of lubricants for:
(a) metal axle of laser unit
(b) plastic gears of transport
I was about to use, for (a): Servisol Silicone Grease, and for (b): Vaseline, but I could be dissuaded.

For lubricating plastic gears I use a synthetic grease that is not silicone or petroleum based. For lubricating delicate mechanisms I use watch and clock oil. For general lubrication I use white lithium grease from the automobile parts store.
Regards,
Ray

Different manufacturers use different lubricants for each. For nylon gears you are reasonably safe using a small amount of white grease. The transverse assy (or sled ...) may use anything from Diamond oil (Denon 52900540007) to something thick and gooey as in an older Pioneer. Graphite grease has been discontinued from use by almost all I think.